I love them too (& my torts leaves & flowers) this year I have used window boxs along my enclosure walls! Stop them eating the lot, including roots!
Every time I popped into Lidl last summer & early this I seemed to buy 5 pkts of seeds for £1! I found loads when I opened my seed box!
They are the varieties Emma mentioned but I also brought some "ladybird" cream red varieties from the internet which havent flowered yet, looking forward to them.
I have also got seeds for red plantain & pink dandelions! I will let you know how I get on!